You may be new, but I spent half an hour last night trying to figure out why my new Brick (what I and others call the PLC product) kept telling me it wanted an SD card on the VNC client when I just put a new one in.
Then I tried reading it with an adapter on my computer and it made the Windows "ching - happy bell" noise but wouldn't read. Then I tried re-inserting it in the adapter. Four times.
Then I got another new micro SD card and put it in. The problem went away.
The moral of the story is you are not the first to get bit by defective removable media. Nor will you be the last. It's something we all need to keep in mind.